Step 1: The explanation of what will happen

The experiment baking soda and vinegar is deceptively simple: what appears to be one reaction is actually two, happening in quick succession. This reaction is an example of a multi-step reaction.

What actually happens is this: the acetic acid (that's what makes vinegar sour) reacts with sodium bicarbonate (a compound that's in baking soda) to form carbonic acid. It's really a double replacement reaction. Carbonic acid is unstable, and it immediately falls apart into carbon dioxide and water (it's a decomposition reaction). The bubbles you see from the reaction come from the carbon dioxide escaping the solution that is left. Carbon dioxide is heavier than air, so, it flows almost like water when it overflows the container. It is a gas that you exhale (though in small amounts), because it is a product of the reactions that keep your body going.

What's left is a dilute solution of sodium acetate in water.

Basing my opinion on these facts I think that the "put the baking soda down first," will work best.

Step 2: Cold baking soda room temperature vinegar result #1

I put some baking soda in the freezer for 20 minutes and then put it in a glass of room temperature vinegar and the result was not what I expected.

It reacted well at first and then it fizzled out very quickly leaving a whole lump of baking soda and a pool of vinegar beside it, I stirred it up and it reacted like the first time and did the same thing again I stirred it up again and nothing happened.

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